ASCE Structures Conf- RMI

8/18/2019 ASCE Structures Conf- RMI

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Rack anufacturers Institute

Independent! incorporated non%profit &rade

#ssociation formed in '()* to ad$ance

standards! +uality! safety and general

fitness for intended use of Industrial "teel

"torage Rack "ystems,


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"pecification for the Design! &esting and-tilization of Industrial "teel "torage Racks

First edition in '(./

First seismic design information in '(01 #ppro$ed as an #2"I "tandard in '(0/

Current #2"I "tandard 3 '.,'%144/

Current RI "pecification #pril 1440


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"torage Rack DescriptionFrames braced in the cross%aisle direction,

"helf beams tying the frames together do5n%aisle,

6eam connectors on the end of the beams,

6ase plates anchored to the floor 5ith post%installed anchors,


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7oad Combinations

Introduce a Product 7oad 8P79 P7 a;imum 7oad from pallets or products

stored on the racks,


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7oad Combinations


stored on the racks,

7RFD design method

',1D7 < ',/P7 < ',.77 < 4,)87r or "7 or R79


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7oad Combinations


stored on the racks, P7app =hen checking for seismic uplift! the

portion of pallet or product load that is used tocompute the seismic base shear,


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7oad Combinations

Include $ertical component of seismic force

#"D design method

>9 84,. % 4,''"D"9D7 < 84,. % 4,'/"D"9P7app%E7/9 8' < 4,''"D"9D7 < 8' < 4,'/"D"9P7 < 77 < 87r or "7 or R79


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"eismic Resistance

RI "ection 1,.

Do5n%aisle % oment frames

6eam Connector as the inelastic element,


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"eismic Design based on E+ui$alent 7ateralForce procedure,

?ther methods are encouraged such as

Displacement%6ased #nalysis RI uses the current ground motion

parameters from the -"@" CD

"s! "'! Fa! F$

"ite soil conditions are generally not kno5n andare assumed to be D


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RI "ection 1,.,1

IP is the system importance factor IP ',) for essential facilities or hazardous material

storage,

IP ',4 for all other rack structures,

For storage rack in areas open to the public! 8e,g,! in

5arehouse retail stores9! IP ',), If a displacement basede$aluation of the rack structure is performed in either of thet5o principle directions of the rack! IP may be taken as ',4 in

that direction,

sps =ICA =


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RI "ection 1,.,1

=" is the system seismic mass ="

P7app P7RF ; P7

P7RF is the pallet load reduction factor

sps =ICA =

( )4 .0 4 1), ,;P7 ;P7 D7 ;77RF + +

"eismic Force Direction P7RF

Cross%#isle ',4

Do5n%#islea;imum

#$erage

P7P7


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RI "ection 1,.,1

=" is the system seismic mass ="

P7 #$erage

For 5arehouse retail stores! open to the general public! P7 #$erage shall be taken

as P7a;imum,

For all other types of 5arehousing P7 #$erage is the ma;imum total 5eight of

product e;pected on all the beam le$els in any ro5 di$ided by the number

of beam le$els in that ro5,

P7a;imum

a;imum 5eight of product that 5ill be placed on any one beam le$el in that

ro5,

sps =ICA =

( )4 .0 4 1), ,;P7 ;P7 D7 ;77RF + +

a;imum

#$erage

P7P7


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#dBusted CE "pectral Response #cceleration Parameters

"" Fa"" "' F$"'

Design "pectral Response #cceleration Parameters

"D" 81>9"" "D' 81>9"'

"eismic Response Coefficient

but need not

be more than:

but shall not be taken as less than: 4,4// "D"

#dditionally! 5here "' 4,.g C" shall not be less than

&R

"C D's =

R

"C D"s =

R

4,)"C 's =


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Connection Rotational Capacity

RI "ection 1,.,/

Connector # from testing in "ection (,. shall

be greater than:

( )

total

sdD

h

GH'',)C

+=


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RI "ection 1,.,/


be greater than:

Cd is the deflection amplification factor, FromFE# /.4 Cd ),)

( )

total

sdD

h

GH'',)C

+=


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RI "ection 1,.,/


be greater than:

a

is the second order amplification factor fromFE# /.4

( )

total

sdD

h

GH'',)C

+=

++

+

+

=∑=

ceb

bec

bec

cebbc

N

i bec

bec pi pi

k k

k k

k k

k k N N

k k

k k hW

L

1

α


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RI "ection 1,.,/


be greater than:

D

s is the seismic displacement,&he displacement shall be determined using the

same structural system stiffness as used to

determine the period for the base shear

calculation,

( )

total

sdD

h

GH'',)C

+=


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Connection testing

"trength testing – Cantile$er test

RI "ection (,/,'

Cyclical testing

RI "ection (,.


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Cyclical &est Results


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#dditional RI "pecification re+uirements

7oad #pplication and Rack ConfigurationDra5ing

Capacity Pla+ue


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#dditional RI 6enefits

R%ark


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Juestions

Feel free to contact me 5ith any +uestions or comments:

Daniel Clapp

Frazier Industrial Co

7ong Aalley! 2K 40*)>

8(4*9*0.%>44' ; 101

DClappLFrazier,com

Documents

ASCE Structures Conf- RMI